"Untouched" is an electro pop song sung by The Veronicas written by Jessica Origliasso, Lisa Origliasso and Toby Gad (known for co-writing with Fergie, Fergie's "Big Girls Don't Cry" and Beyoncé Knowles's "If I Were a Boy"), produced by Gad for The Veronicas second album Hook Me Up (2007). It was released as the album's second single in Australia on December 10, 2007. The song is notable for becoming the band's breakout hit in the U.S., reaching the top twenty on the Hot 100 and selling over 1,000,000 downloads in the U.S. so far.

The music video for the song was filmed at the Marble Bar in Sydney’s Hilton Building and it took eighteen hours to film with fifty extras dressed in gothic glamour. The video starts with a lot of pictures in the hallway. It goes to the band performing with a crowd in front of them. Jess and Lisa are in the hallway singing. They meet a man later. In the chorus, Jess and Lisa performed with the rest of the group. Jess is hanging around with the man and after a while, she goes to get something. The man then sees Lisa walking around in the crowd, and, since they are twins, he thinks that she is Jess. So he follows her and brings her back to the couch where he was sitting. In a little bit, Lisa comes back to the couch. She sees that the man is kissing Jess, and is offended. They see that he is trying to make a move with both of them, so together, they walk away. The music video was released on December 3, 2007 to Australian music channel shows. The video made its debut on MTV TRL as a first look on July 9, 2008 and a week later made its debut on the countdown at #10.